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stacker:docs:tables:macromicrodof [2020/10/15 02:25] rjlittlefield update tables to use formula more accurate for large NA |
stacker:docs:tables:macromicrodof [2023/02/16 06:16] rjlittlefield add link to interactive calculator |
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| ====== DOF Estimates For Macro/Micro (depth of field, step sizes) ====== | ====== DOF Estimates For Macro/Micro (depth of field, step sizes) ====== | ||
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| + | ** NEW: --> [[https://zerenesystems.com/cms/stacker/docs/dofcalculator|interactive calculator for macro/micro DOF]] ** | ||
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| The best step size for macro/micro applications depends strongly on several things: | The best step size for macro/micro applications depends strongly on several things: | ||
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| ^ 20 | //0.0096 mm // | //0.019 mm // | //0.039 mm // | //0.076 mm // | //0.16 mm // | //0.29 mm // | //0.62 mm // | //1.2 mm // | | ^ 20 | //0.0096 mm // | //0.019 mm // | //0.039 mm // | //0.076 mm // | //0.16 mm // | //0.29 mm // | //0.62 mm // | //1.2 mm // | | ||
| - | Numbers in the above table can be closely reproduced by the formula DOF = (0.0022*N*N*(m+1)*(m+1))/(m*m) , where N is the F-number and m is magnification. \\ | + | Numbers in the above table can be closely reproduced by the simplified formula \\ DOF = (0.0022*N*N*(m+1)*(m+1))/(m*m) , where N is the F-number and m is magnification. \\ |
| Example: F-number 5.6 and magnification 0.50 computes as DOF = (0.0022*5.6*5.6*(0.50+1)*(0.50+1))/(0.50*0.50) = 0.6209 . | Example: F-number 5.6 and magnification 0.50 computes as DOF = (0.0022*5.6*5.6*(0.50+1)*(0.50+1))/(0.50*0.50) = 0.6209 . | ||
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| ^ 3.5 | 0.00053 mm | 0.0013 mm | 0.0027 mm | 0.0055 mm | **0.011 mm ** | **0.022 mm ** | **0.046 mm ** | //0.087 mm // | | ^ 3.5 | 0.00053 mm | 0.0013 mm | 0.0027 mm | 0.0055 mm | **0.011 mm ** | **0.022 mm ** | **0.046 mm ** | //0.087 mm // | | ||
| ^ 5.0 | --- | 0.00050 mm | 0.0013 mm | 0.0026 mm | **0.0055 mm ** | **0.011 mm ** | **0.022 mm ** | //0.042 mm // | | ^ 5.0 | --- | 0.00050 mm | 0.0013 mm | 0.0026 mm | **0.0055 mm ** | **0.011 mm ** | **0.022 mm ** | //0.042 mm // | | ||
| - | Numbers in the above table can be closely reproduced by the formula DOF = (0.0022*N*N)/(m*m), where N is the F-number and m is magnification. \\ | + | Numbers in the above table can be closely reproduced by the simplified formula \\ DOF = (0.0022*N*N)/(m*m), where N is the F-number and m is magnification. \\ |
| Example: F-number 5.6 and magnification 0.50 computes as DOF = (0.0022*5.6*5.6)/(0.50*0.50) = 0.2760 . | Example: F-number 5.6 and magnification 0.50 computes as DOF = (0.0022*5.6*5.6)/(0.50*0.50) = 0.2760 . | ||
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| | 0.55 | 0.0017 mm | | | 0.55 | 0.0017 mm | | ||
| - | Numbers in the above table can be closely reproduced by the formula DOF = 0.00055/(NA*NA) . \\ | + | Numbers in the above table can be closely reproduced by the simplified formula DOF = 0.00055/(NA*NA) . \\ |
| Example: NA 0.25 computes as DOF = 0.00055/(0.25*0.25) = 0.0088 . | Example: NA 0.25 computes as DOF = 0.00055/(0.25*0.25) = 0.0088 . | ||